Control device for vehicle

Abstract

In a vehicle including a charge circuit for carrying out external charging to charge a vehicle-mounted battery with a power supply external to the vehicle, a vehicle ECU. determines that there is an impedance error when a state where a reduction width of an input voltage Vin applied to the charge circuit from the power supply external to the vehicle is exceeding a threshold width ΔV continues for a predetermined time, and outputs a first termination instruction to a charger ECU. The charger ECU receiving the first termination instruction causes the charge circuit to stop to terminate external charging. The charger ECU controls the charge circuit such that, when the input voltage Vin falls down to a threshold voltage V1 the current flowing through an external power supply system is reduced to suppress further reduction in the input voltage Vin.

The invention claimed is:  
     
       1. A control device for a vehicle including a power storage device and a charge circuit for carrying out external charging in which said power storage device is charged with a power supply external to the vehicle, said charge circuit being stopped when an input voltage applied to said charge circuit from said power supply drops to become lower than a lower limit voltage value at which said charge circuit can operate,
 said control device comprising: 
 a suppression unit executing suppression control for suppressing a drop of said input voltage before said input voltage becomes lower than said lower limit voltage value during said external charging, and 
 a first charge termination unit determining whether an impedance error is occurring at a charge path based on a reduction width of said input voltage during said external charging, and terminating said external charging when a determination is made that said impedance error is occurring,
 said first charge termination unit determining that said impedance error is occurring when a state where the reduction width of said input voltage is exceeding a threshold width continues during said external charging, and 
 said suppression unit executing said suppression control for a predetermined time during which said first charge termination unit can determine that said impedance error is occurring. 
 
 
     
     
       2. The control device for a vehicle according to  claim 1 , wherein said suppression control includes control to reduce current flowing through said charge path when said input voltage drops down to a threshold voltage higher than said lower limit voltage value during said external charging. 
     
     
       3. The control device for a vehicle according to  claim 1 , wherein
 said suppressing unit terminates said external charging when said external charging is not terminated by said first charge termination unit even after said predetermined time has elapsed from the start of said suppression control. 
 
     
     
       4. The control device for a vehicle according to  claim 1 , wherein said charge circuit is activated when said input voltage returns to a level greater than or equal to said lower limit voltage value,
 said control device further comprising a second charge termination unit determining that there is said impedance error to terminate said external charging when stopping and activation of said charge circuit are repeated. 
 
     
     
       5. The control device for a vehicle according to  claim 4 , wherein said second charge termination unit determines that there is said impedance error to terminate said external charging when said input voltage is reduced during said external charging and a count of said charge circuit stopping within a predetermined time starting from reduction in said input voltage exceeds a predetermined count. 
     
     
       6. The control device for a vehicle according to  claim 1 , further comprising a notification unit notifying a user about said impedance error.